JP6358909B2 - Work vehicle - Google Patents

Description

  The present invention relates to a work vehicle including a diesel engine, an exhaust gas purification device including a filter that collects particulate matter contained in exhaust gas discharged from the diesel engine, and a work device.

  In order to improve and solve environmental problems in recent years, exhaust gas regulations for diesel engines and the like have been strengthened. In work vehicles such as construction machines and agricultural machines, various techniques for reducing particulate matter (particulate matter) contained in exhaust gas have been developed in order to cope with such exhaust gas regulations. For example, an exhaust gas purification device that collects particulate matter contained in exhaust gas is mounted on a work vehicle. The exhaust gas purifying device collects particulate matter by passing the exhaust gas through a diesel particulate filter (hereinafter simply referred to as DPF) provided inside. Since the collected particulate matter gradually accumulates in the DPF of the exhaust gas purification device, the particulate matter is appropriately removed to prevent the DPF from becoming clogged and increasing the air resistance of the exhaust system. I have to play it.

  One of the regeneration controls for the DPF is disclosed in Patent Document 1. In this regeneration control, when the amount of particulate matter deposited on the DPF exceeds a predetermined value, the particulate matter is deposited regardless of the vehicle state, for example, even if the vehicle state is not sufficiently adapted to the DPF regeneration process. Automatic regeneration is performed to automatically burn and remove particulate matter. However, although automatic regeneration is performed when the amount of particulate matter deposited exceeds the deposition amount threshold, the amount of particulate matter deposited within a predetermined time from the start of automatic regeneration. If it is not below the warning cancellation threshold value lower than the threshold value, a warning is issued to increase the rotational speed of the diesel engine. Patent Document 1 does not disclose that when the DPF regeneration process is executed, the regeneration of the DPF is interrupted according to the vehicle state.

JP 2013-72319 A

  In view of the above circumstances, there is a need for a technique in which the start and stop of the filter regeneration process are controlled in consideration of not only the state of particulate matter accumulation in the filter of the exhaust gas purification device but also the state of the vehicle. ing.

A work vehicle according to the present invention comprising a diesel engine, an exhaust gas purification device including a filter that collects particulate matter contained in exhaust gas discharged from the diesel engine, and a work device. A vehicle condition data acquisition unit for acquiring vehicle condition data indicating the state of the exhaust gas, and a regeneration process request based on the necessity of filter regeneration process for burning and removing particulate matter deposited on the filter of the exhaust gas purification device In response to the start command and the stop command; a filter regeneration request unit that outputs a start command and a stop command for the filter regeneration process based on the regeneration process request and the vehicle state data; A device control unit for automatically controlling the device for executing the filter regeneration process ,
The vehicle state data includes engine speed data, and the purification processing determination unit sets the engine speed condition that the engine speed exceeds a reference engine speed higher than an idling speed, and the engine When the engine speed condition is satisfied and the regeneration process request is output, the start command is output. When the engine speed condition is not satisfied, or when the regeneration process request is not output, Output stop command,
While the filter regeneration process is performed, when said engine rotational speed falls below the engine rotational speed condition, the stop command to interrupt the filter regeneration process is Ru is output after a predetermined delay time.

  According to this configuration, the filter regeneration process is started based on two conditions: the necessity of the filter regeneration process for burning and removing particulate matter deposited on the filter, and the state of the vehicle. For this reason, if the necessity of the filter regeneration process increases, the filter regeneration process is not automatically executed. If the vehicle state is not suitable for the filter regeneration process, the filter regeneration process is delayed. . Further, the filter regeneration process is stopped based on two conditions, that is, the necessity of the filter regeneration process for burning and removing the particulate matter deposited on the filter and the state of the vehicle. For this reason, even if the filter regeneration process is being executed, if the vehicle state becomes unsuitable for the filter regeneration process, the filter regeneration process is interrupted. This makes it possible to perform more appropriate filter regeneration processing.

In general, particulate matter collected by a filter of an exhaust gas purification device called DPF is removed by burning it with high-temperature engine exhaust gas. Therefore, in order to perform filter regeneration processing, engine exhaust gas The temperature needs to be raised. The engine exhaust gas temperature required for the filter regeneration process is obtained with a high reference engine speed exceeding the idling speed. This reference rotational speed can be preset based on engine specifications. Therefore, for proper filter regeneration, in this onset bright, wherein the vehicle condition data includes the engine speed data, the purification process determination unit, the engine speed is above idle speed The engine speed condition is that the engine speed exceeds a high reference engine speed. When the engine speed condition is satisfied and the regeneration processing request is output, the start command is output. The purification process determination unit outputs the stop command when the engine speed condition is not satisfied, or when the regeneration process request is not output.

The engine speed temporarily decreases during work travel and non-work travel, for example, during turning travel and obstacle avoidance travel. Even in such a case, it is not appropriate to always interrupt the filter regeneration process because the engine speed condition is not satisfied. For this reason, it is not satisfied engine rotational speed condition, in situations where filter regeneration process has been started standby or suspend, when the engine speed is satisfied rises and engine speed conditions, consciously by the driver Therefore, it is preferable to immediately execute the filter regeneration process.

  In the filter regeneration process, the engine rotates at a high speed and the exhaust gas temperature becomes high. For this reason, it is preferable that the filter regeneration process is performed during high-speed traveling rather than during low-speed traveling. When the work vehicle of the present invention is a combine equipped with a threshing device as a work device, it is one preferable measure to avoid the filter regeneration process during the mowing and threshing operation which is a low-speed traveling. When the working device is a threshing device and the vehicle state data includes threshing ON data indicating that the threshing device is being driven, the purification processing determination unit receives the threshing ON data. It is one of the preferred embodiments that the stop command is forcibly output during this time.

  In the present invention, even if the necessity of the filter regeneration process for burning and removing the particulate matter deposited on the filter is high, the filter regeneration process is not performed unless the state of the vehicle is appropriate. However, if the filter regeneration process is not performed for a long time despite the need for the filter regeneration process, clogging of the filter increases, leading to deterioration of the performance of the exhaust gas purification device and deterioration of the engine performance. For this reason, in one of the preferred embodiments of the present invention, when the state where the start command is not output continues for a predetermined time despite the output of the regeneration processing request, the forced regeneration preparation mode is set and the manual forced regeneration is performed. A reproduction warning that prompts execution of the process is notified. By this notification, the driver performs an operation for executing the manual forced regeneration process, whereby the filter regeneration process is started, and the filter clogging is eliminated.

  In the manual forced regeneration process, the driver activates the filter regeneration process by using the operation device by himself / herself, but in the filter regeneration process, the engine rotates at high speed, so the driver is conscious of the filter regeneration process. It is important to do so in a parked state. Therefore, in one of the preferred embodiments of the present invention, in the forced regeneration preparation mode, when the parking state of the vehicle is determined based on the vehicle state data, the execution of the manual forced regeneration process is commanded. The parking regeneration start operation switch is configured to be in an effective state.

It is a schematic diagram explaining the basic principle of the filter regeneration process of the exhaust gas purification apparatus employ | adopted as the working vehicle by this invention. It is a side view of a combine which is one of the embodiments of the work vehicle by the present invention. It is a top view which shows an engine and an exhaust-gas purification apparatus. It is a left view which shows an engine and an exhaust-gas purification apparatus. It is a schematic diagram explaining a filter regeneration processing control system. It is a flowchart figure which shows an example of the flow of control in a filter reproduction | regeneration processing control system.

  Before describing a specific embodiment of the work vehicle according to the present invention, the basic principle of the filter regeneration process of the exhaust gas purifying apparatus that characterizes the present invention will be described with reference to FIG. This exhaust gas purifying apparatus includes a filter that collects particulate matter contained in exhaust gas discharged from a diesel engine (hereinafter simply referred to as an engine), and the particulate matter deposited on the filter through filter regeneration processing. The material burns and is removed from the filter. For this reason, in the filter regeneration process, the engine is rotated at a high speed, and high-temperature exhaust gas is sent to the filter. This filter is generally called a DPF.

  FIG. 1 shows an example of a functional block diagram of a control system that controls the filter regeneration processing. This control system includes an input signal processing unit 71, a device control unit 72, a vehicle state data acquisition unit 61, a filter regeneration request unit 62, and a purification processing determination unit 63. The input signal processing unit 71 inputs analog signals or digital signals from the sensor / switch group 9 which is a sensor or switch for detecting the state of equipment mounted on the vehicle, and is required for AD conversion, format conversion, etc. Pre-processing is performed. This signal includes DPF-related data and vehicle state data that are information related to the DPF. Examples of the vehicle state data include engine speed, brake state data, vehicle speed data, work device state data, and the like.

  The vehicle state data acquisition unit 61 receives the vehicle state data indicating the state of the vehicle from the input signal processing unit 71, converts it into the contents required by each function unit, and sends it to the necessary function unit. The filter regeneration requesting unit 62 calculates the degree of necessity of filter regeneration processing for burning and removing particulate matter deposited on the filter (DPF) of the exhaust gas purification device, and the calculated degree of necessity is set to a predetermined threshold. When the value is exceeded, a playback processing request is output. The necessary degree is calculated based on a preset reproduction necessity calculating algorithm using DPF related data received from the input signal processing unit 71 as a parameter. The DPF related data includes temperature, pressure, usage time, and the like, which are input parameters for the regeneration necessity calculation algorithm.

  The purification process determination unit 63 outputs a start command and a stop command for the filter regeneration process based on the regeneration process request output from the filter regeneration request unit 62 and the vehicle state data output from the vehicle state data acquisition unit 61. Upon receiving the start command from the purification processing determination unit 63, the device control unit 72 gives a control signal necessary for the device involved in the filter regeneration processing in order to execute the filter regeneration processing. On the contrary, when a stop command is received from the purification process determination unit 63, a control signal for stopping the execution of the filter regeneration process is given to a device related to the filter regeneration process.

  In the purification process determination unit 63, an engine speed condition that the engine speed exceeds a reference engine speed higher than the idling speed can be adopted as at least one of the conditions for executing the filter regeneration process. . In that case, the vehicle state data acquisition unit 61 receives engine speed data as one of the vehicle state data from the input signal processing unit 71. The purification process determination unit 63 outputs a start command when the regeneration process request is output and the engine speed exceeds the reference engine speed as a threshold value. In general, the reference engine speed is preferably about 2000 RPM, although it varies depending on the engine specifications and the DPF specifications. On the other hand, even if the regeneration process request is output, the filter regeneration process is not executed if the engine speed is equal to or lower than the reference engine speed. If the engine speed becomes equal to or lower than the reference engine speed during the filter regeneration process, a filter regeneration process stop command is output to the device control unit 72, and the filter regeneration process is interrupted. However, in the case of a work vehicle, it is not uncommon for the engine speed to decrease in the short term due to brake operation, etc., so wait for the engine speed to exceed the reference engine speed again in a short period of time, and then check the reference engine speed. It is good to comprise so that a stop command may be output in the stage where the following engine speeds have continued for a predetermined time. The predetermined time for delaying the output of the stop command is suitably within 1 minute, for example, 20 to 30 seconds, but the present invention is not limited to this.

  Even though the filter regeneration requesting unit 62 outputs the regeneration process request for a long period of time, the condition for executing the filter regeneration process based on the state of the vehicle is not satisfied, which may cause a disadvantage that the filter regeneration process is not performed. In order to avoid this inconvenience, a manual forced regeneration processing management unit 64 is provided in the example shown in FIG. The manual forced regeneration processing management unit 64 sets the forced regeneration preparation mode when a start command is not output from the purification processing determination unit 63 for a predetermined time despite the output of the regeneration processing request from the filter regeneration requesting unit 62. To do. In the forced regeneration preparation mode, a regeneration warning that prompts execution of the manual forced regeneration process is notified through the notification unit 73. Specifically, manual forced regeneration processing may be prompted by voice through a speaker, or a message prompting manual forced regeneration processing may be displayed on the display panel.

  Such a manual forced filter regeneration process is preferably performed in an emergency evacuation with the vehicle parked. For example, a parking regeneration start operation switch 90 which is normally set to inactive (invalidated) and is activated (validated) on condition that the parking brake is operated or the transmission mechanism is set to neutral is provided. The filter regeneration process is executed by the driver operating the activated parking regeneration start operation switch 90. Thereby, execution of the filter reproduction | regeneration process contrary to the intention by the parking reproduction start operation switch 90 having been operated carelessly is suppressed.

  Next, one specific embodiment of the work vehicle according to the present invention will be described with reference to the drawings. FIG. 2 is a side view of a combine which is an example of a work vehicle. 3 is a plan view showing the engine and the exhaust gas purification device of the combine, and FIG. 4 is a left side view showing the engine and the exhaust gas purification device.

  This combine is a self-removable combine and includes a crawler type traveling device 1 and a body frame 2 supported by the traveling device 1. The front part of the machine body frame 2 is provided with a mowing part 3 that can lift and lower the planted cereal. At the rear of the machine body frame 2, a threshing device 4 for threshing the harvested cereal meal and a grain tank 5 for storing the grain are arranged side by side in the left-right direction. A driving cabin 6 on which a driver gets on is provided in front of the grain tank 5 at the front of the machine body frame 2. An engine unit 7 is provided below the operation cabin 6. The grain tank 5 is provided with an unloader 8 that discharges the grains in the grain tank 5.

  The cutting unit 3 is configured to be swingable around a swing axis that is directed in the left-right direction. The harvesting unit 3 includes a pulling device 10 </ b> A that causes a planted cereal cocoon, a reaping device 10 </ b> B that trims the pulverized cereal masher, and a transport device 11 that conveys the chopped cereal cake to the threshing device 4. The pulling device 10 </ b> A is supported by a cutting gear case 13 that accommodates a cutting input shaft (not shown) via a pulling support pipe 12. The upper part of the cutting part 3 is covered from above by a front dustproof cover 14 and a rear dustproof cover 15.

  As shown in FIG. 3, the driving cabin 6 is provided with a driving seat 16 on which a driver is seated. A front panel 18 having instruments such as a speedometer 17 is provided on the front side of the driver seat 16. On the left side of the driver's seat 16, a side panel 20 having an operation lever such as a transmission lever 19 is provided. On the right side of the driving cabin 6, a boarding / exiting opening 21 through which the driver gets on and off is provided. A main step 22 and an auxiliary step 23 are provided on the lower side of the entrance 21 as a stepping platform for getting on and off.

  As shown in FIGS. 3 and 4, the engine unit 7 includes an engine 24 that is a diesel engine, an exhaust pipe unit 25 that exhausts exhaust from the engine 24, and an exhaust gas purification device 26. . In the present embodiment, the exhaust gas purification device 26 includes a so-called DPF (diesel particulate filter) that collects particulate matter contained in the exhaust gas.

  The exhaust gas purifying device 26 is supported on the upper part of the engine 24 in such a posture that its longitudinal direction is the front-rear direction. In the lower part of the front end of the exhaust gas purification device 26, an inlet 26a into which exhaust from the engine 24 flows is provided. An exhaust port 24a that exhausts exhaust gas from the engine 24 is connected to the inflow port 26a. On the left side of the rear end of the exhaust gas purification device 26, there is provided an outlet 26b through which exhaust gas processed by the exhaust gas purification device 26 flows out. An exhaust pipe unit 25 is connected to the outflow port 26b.

  It is necessary to perform a filter regeneration process in which particulate matter deposited on the DPF of the exhaust gas purification device 26 is burned and removed. The filter regeneration process for the exhaust gas purifying device 26 mounted on the combine uses the basic principle described with reference to FIG. FIG. 5 shows a functional block diagram showing functional units related to control of the engine regeneration, its exhaust system, schematic diagram, and filter regeneration processing.

  As shown in FIG. 5, an intake port 241 that is an opening for introducing air into the cylinder is formed in the upper portion of the cylinder of the engine 24, and gas after combustion (combustion gas) is discharged from the cylinder. An exhaust port 242 is formed as an opening for this purpose. Further, an intake valve 243 for opening and closing the intake port 241 and an exhaust valve 244 for opening and closing the exhaust port 242 are provided at the upper part of the cylinder.

  The intake port 241 is connected to a tubular intake manifold 245 serving as a flow path for air introduced into the cylinder. The exhaust port 242 is connected to a tubular exhaust pipe unit 25 that serves as a flow path for combustion gas discharged from the cylinder.

  An exhaust gas purification device 26 is provided in the middle of the exhaust pipe unit 25. The exhaust gas purification device 26 collects and purifies the particulate matter contained in the exhaust gas passing therethrough. That is, the combustion gas discharged from the cylinder through the exhaust port 242 passes through the exhaust pipe unit 25 as exhaust gas and is purified by the exhaust gas purification device 26.

  The exhaust gas purification device 26 has a DPF 260 inside. The DPF 260 is a filter for collecting particulate matter contained in the exhaust gas. For example, the DPF 260 is made of ceramic and has a cross section having a honeycomb structure. That is, a number of hexagonal column-shaped polygonal through holes, for example, are adjacent to each other along the longitudinal direction from one end to the other end of the DPF 260, and each through hole has a predetermined interval along the longitudinal direction of the DPF 260. A porous partition is provided.

  The exhaust gas that has entered from the inlet of the DPF 260 flows toward the outlet of the DPF 260 while passing through the porous partition formed in the through hole. Particulate matter contained in the exhaust gas is collected by the DPF 260 by adhering to the porous partition wall or adhering to the inner wall of the through hole, and the exhaust gas purified by the DPF 260 is released to the outside. Although not shown, the exhaust system of the engine 24 is an oxidation catalyst (diesel) for oxidizing fuel in particulate matter and nitrogen oxides in combustion gas between the entrance side of the DPF 260 and the engine 24. Oxidation catalyst) and the like.

  In this embodiment, the filter regeneration process for the exhaust gas purification device 26 is executed by controlling the engine / exhaust system via the engine control unit 70 based on a control command from the filter regeneration control unit 60. That is, the filter regeneration process is performed under the control of the engine 24 different from the normal time, but the details thereof are well known and are omitted here. Further, the description using FIG. 1 is basically applied to the configuration and function of the filter regeneration control unit 60 that manages the start and stop of the filter regeneration process. However, in FIG. 5, as a control element of the device control unit 72, the threshing device 4 that is one of the working devices mounted on the combine, and the working device switch included in the sensor switch group 9, A threshing switch 91 that turns the operation on and off is illustrated.

An example of the flow of control in the filter regeneration processing control system described with reference to FIG. 5 is shown in FIG.
In this filter regeneration process, first, the filter regeneration request unit 62 calculates the PM accumulation amount as the necessity of the filter regeneration process (# 01). As an example of this calculation, for example, the PM deposition amount can be estimated from the differential pressure between the exhaust pressure on the inlet side of the DPF 260 and the exhaust pressure on the outlet side of the DPF 260. Specifically, the filter regeneration request unit 62 of the filter regeneration control unit 60 detects the exhaust pressure detected by the inflow side pressure sensor 261 that detects the exhaust pressure near the inflow side of the exhaust gas purification device 26 and the outflow of the exhaust gas purification device 26. The PM accumulation amount is calculated from the difference between the exhaust pressure on the inflow side and the outflow side of the exhaust gas purification device 26 from the exhaust pressure detected by the outflow side pressure sensor 262 that detects the exhaust pressure near the exhaust side. When the PM accumulation amount is large, the differential pressure that is the difference in exhaust pressure is large, and when the PM accumulation amount is small, the relationship that the differential pressure of the exhaust pressure is small is utilized. In this embodiment, the PM deposition amount is calculated from the difference in exhaust pressure, but the present invention is not limited to this. It is also possible to calculate the PM accumulation amount, that is, the necessity of filter regeneration processing, based on the operating time of the engine 24 and the fuel consumption. Any method for calculating the degree of necessity of the filter regeneration processing may be used.

  It is checked whether the calculated PM accumulation amount (necessity of filter regeneration processing) exceeds a preset threshold value (# 02). If the PM accumulation amount is equal to or greater than the threshold value (# 02, Yes), it is further checked whether the start flag is “0” (# 03). Further, if the start flag is “0” (filter regeneration processing is stopped) (# 03, Yes), it is further checked whether the necessary flag is “0” (# 04). If the necessary flag is “0” (no filter regeneration processing is required) (# 04, Yes), a warning timer that starts a warning and measures a grace time for shifting to manual forced regeneration processing starts (# 05). The necessary flag is set to “1” (# 06). If the start flag is not “0”, the filter regeneration process is being executed (# 03, No), and if the necessary flag is not “0”, the regeneration process is requested (# 04, No), so step # 05. And # 06 are omitted.

  If the PM accumulation amount is equal to or smaller than the threshold value in step # 02 (# 02, No), it is further checked whether the start flag is “1” (# 11). If the start flag is "1" (filter regeneration process is being executed) (# 11, Yes), a stop command is output by the purification process determination unit 63 (# 12). Furthermore, “0” is entered in the necessary flag (# 13), and “0” is entered in the start flag (# 14). Thereafter, the process returns to step # 01. If the start flag is not “1” in step # 11 (# 11, No), the filter regeneration process is stopped, and the process jumps directly to step # 01.

  Next, the vehicle state data acquisition unit 61 acquires vehicle state data such as the engine speed and the state of the threshing switch 91 (# 20). Based on the acquired vehicle state data, it is checked whether or not the current vehicle state (for example, the engine speed) is suitable for the filter regeneration process (# 21). If the vehicle state is suitable for the filter regeneration process (# 21, Yes), it is further checked whether or not the start flag is “1” (# 22). If the start flag is not “1” (if the filter regeneration process has not been executed yet) (# 22, No), the purification process determination unit 63 outputs a start command (# 23). As a result, the filter regeneration process is executed, so that “1” is entered in the start flag (# 24), and the warning timer is reset (# 25). If the start flag is “1” in the check of step # 22 (# 22, Yes), the filter regeneration process is being executed, and the process jumps to step # 01.

  If the vehicle state is not suitable for the filter regeneration process in step # 21 (# 21, No), it is further checked whether the start flag is “1” (# 31). If the start flag is “1” (filter regeneration process is being executed) (# 31, Yes), a stop command is output by the purification process determination unit 63 (# 32). Further, “0” is entered in the start flag (# 33), and the process returns to step # 01.

  If the start flag is not “1” in step # 31 (# 31, No), it is checked whether the necessary flag is “1” (# 41). If the necessary flag is “1”, it is further checked whether the warning timer has been typed up (# 42). If the necessary flag is not “1” in step # 41 and the warning timer is not typed up in step # 42, the process returns to step # 01. If the necessary flag is “1” in step # 41 and the warning timer is typed up in step # 42, the urgent level of the filter regeneration process has increased, so the warning forced regeneration process is executed (# 50).

  In the warning forced regeneration process, a regeneration warning that prompts execution of the manual forced regeneration process is notified through the notification unit 73. Specifically, a message prompting the manual forced regeneration process is displayed on the display panel arranged on the front panel 18. Thus, the driver makes the combine suitable for the filter regeneration process, and presses the parking regeneration start operation switch 90, whereby the filter regeneration process as an exception process is executed.

  Next, an example of filter regeneration processing will be described. First, a signal for commanding the throttle of the intake throttle is output to the engine 24 to perform throttle of the intake throttle and post injection, and the temperature of the exhaust gas purifying device 26 is raised to 600 ° C., for example. By such DPF regeneration, the particulate matter deposited on the DPF 260 burns, and the amount of PM deposition decreases. In the regeneration mode, when the PM accumulation amount is significantly reduced, for example, when the PM accumulation amount is reduced by 80% compared to before the filter regeneration process is executed, the DPF regeneration is terminated.

[Another embodiment]
The division of the functional units shown in FIG. 5 is an example, and the integration of the functional units and the division of the functional units are arbitrary. Any configuration is possible as long as the control function of the present invention is realized, and these functions can be realized by hardware and / or software.

  INDUSTRIAL APPLICABILITY The present invention is applicable to agricultural work vehicles such as ordinary combine harvesters, tractors, rice transplanters, and construction work vehicles such as backhoes and wheel loaders in addition to self-removing combine harvesters.

4: Threshing device (working device)
24: Diesel engine 24a: Exhaust port 25: Exhaust pipe unit 26: Exhaust gas purification device 260: DPF
60: Filter regeneration control unit 61: Vehicle state data acquisition unit 62: Filter regeneration request unit 63: Purification process determination unit 64: Manual forced regeneration process management unit 70: Engine control unit 71: Input signal processing unit 72: Device control unit 73 : Notification unit 90: Parking regeneration start operation switch 91: Threshing switch

Claims (5)

A work vehicle comprising a diesel engine, an exhaust gas purification device including a filter that collects particulate matter contained in exhaust gas discharged from the diesel engine, and a work device,
A vehicle state data acquisition unit for acquiring vehicle state data indicating the state of the work vehicle;
A filter regeneration request unit that outputs a regeneration process request based on the degree of necessity of the filter regeneration process for burning and removing the particulate matter deposited on the filter of the exhaust gas purification device;
A purification process determination unit that outputs a start command and a stop command for the filter regeneration process based on the regeneration process request and the vehicle state data;
In response to the start command and the stop command, a device control unit that automatically controls the device for executing the filter regeneration process ,
The vehicle state data includes engine speed data,
The purification process determination unit uses an engine speed condition that the engine speed exceeds a reference engine speed higher than the idling speed, and the regeneration speed request is output while the engine speed condition is satisfied. If the engine rotation speed condition is not satisfied, or if the regeneration processing request is not output, the stop command is output,
When the engine speed falls below the engine speed condition while the filter regeneration process is being performed, the stop vehicle that stops the filter regeneration process is output after a predetermined delay time has elapsed . 2. The work vehicle according to claim 1 , wherein when the filter regeneration process is interrupted, a start command for restarting the filter regeneration process when the engine speed condition is satisfied is output immediately . While the working device is a threshing device, the vehicle state data includes threshing ON data indicating that the threshing device is being driven, and the purification processing determination unit receives the threshing ON data. The work vehicle according to claim 1 or 2 , forcibly outputting the stop command. The forced regeneration preparation mode is set and a regeneration warning prompting execution of the manual forced regeneration process is notified when a state where the start command is not output for a predetermined time despite the output of the regeneration process request is issued. 4. The work vehicle according to any one of 3 . In the forced regeneration preparation mode, wherein if, based on the vehicle state data parked state of the vehicle is determined, according to claim 4, the parking reproduction start operation switch for instructing the execution of the manual forced regeneration process enabled state Work vehicle.

Images